Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities
Net income (loss)	$ 6,525	$ (23,416)	$ 20,611
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	14,713	13,709	12,892
Amortization	4,108	5,208	5,165
Impairment of long-lived assets	502	4,356	40
Non-cash restructuring charge	0	246	287
Deferred income taxes	4,123	(10,524)	(1,159)
Amortization of deferred financing fees	262	301	606
Accretion of discount on multiemployer pension liability	833	0	0
Loss on sale of property and equipment	88	23	137
Loss realized from sale of business	6,251	0	0
Stock-based compensation expense	1,644	3,129	2,098
Tax benefit from stock options exercised	(247)	(244)	(293)
Changes in operating assets and liabilities, net of effects from acquisitions:
Trade accounts receivable	(7,264)	7,471	(349)
Unbilled services	2,792	2,769	(2,393)
Prepaid expenses and other current assets	863	1,234	(818)
Trade accounts payable, accrued expenses and other liabilities	(8,631)	(5,669)	(17,387)
Multiemployer pension plan withdrawal liability	0	29,837	(7,004)
Income taxes refundable (payable)	4,621	2,626	(2,926)
Net cash provided by operating activities	31,183	31,056	9,507
Cash flows from investing activities
Proceeds from sale of business	8,247	0	0
Proceeds from sales of property and equipment	412	31	157
Purchases of property and equipment	(13,211)	(19,764)	(24,721)
Acquisitions, net of cash acquired	0	2,449	(25,232)
Net cash used in investing activities	(4,552)	(17,284)	(49,796)
Cash flows from financing activities
Issuance of common stock	1,802	2,374	1,216
Proceeds from issuance of long-term debt	170,463	220,965	220,868
Payments of long-term debt including current portion	(195,337)	(233,362)	(192,257)
Tax benefit from stock options exercised	247	244	293
Payment of deferred financing fees	0	(857)	(21)
Cash dividends paid	(8,368)	(8,252)	(8,199)
Purchase of common stock	0	0	(4,053)
Net cash (used in) provided by financing activities	(31,193)	(18,888)	17,847
Effect of foreign currency rate changes	1,082	1,035	(715)
Net decrease in cash and cash equivalents	(3,480)	(4,081)	(23,157)
Cash and cash equivalents beginning of period	9,651	13,732	36,889
Cash and cash equivalents end of period	6,171	9,651	13,732
Supplementary cash flow disclosures:
Dividends issued in the form of Class A common stock	54	54	51
Cash paid for interest	3,006	3,778	3,840
Cash paid (refunds received) for income taxes, net	$ (1,400)	$ (3,524)	$ 5,224